How to get "Add Modifiers" panel as enum value?
All available via blenders rna.
The type property of the modifier is an enum, can look up its definition via blenders &quot;rna&quot; system on the class, in this case bpy.types.Modifier.bl_rna
import bpy
from bpy.types import Modifier

for item in Modifier.bl_rna.properties['type'].enum_items:
    print(item.identifier, item.name, item.description, item.icon)

output.
DATA_TRANSFER Data Transfer Transfer several types of data (vertex groups, UV maps, vertex colors, custom normals) from one mesh to another MOD_DATA_TRANSFER
MESH_CACHE Mesh Cache Deform the mesh using an external frame-by-frame vertex transform cache MOD_MESHDEFORM
MESH_SEQUENCE_CACHE Mesh Sequence Cache Deform the mesh or curve using an external mesh cache in Alembic format MOD_MESHDEFORM
NORMAL_EDIT Normal Edit Modify the direction of the surface normals MOD_NORMALEDIT
WEIGHTED_NORMAL Weighted Normal Modify the direction of the surface normals using a weighting method MOD_NORMALEDIT
UV_PROJECT UV Project Project the UV map coordinates from the negative Z axis of another object MOD_UVPROJECT
UV_WARP UV Warp Transform the UV map using the difference between two objects MOD_UVPROJECT
VERTEX_WEIGHT_EDIT Vertex Weight Edit Modify of the weights of a vertex group MOD_VERTEX_WEIGHT
VERTEX_WEIGHT_MIX Vertex Weight Mix Mix the weights of two vertex groups MOD_VERTEX_WEIGHT
VERTEX_WEIGHT_PROXIMITY Vertex Weight Proximity Set the vertex group weights based on the distance to another target object MOD_VERTEX_WEIGHT
ARRAY Array Create copies of the shape with offsets MOD_ARRAY
BEVEL Bevel Generate sloped corners by adding geometry to the mesh's edges or vertices MOD_BEVEL
BOOLEAN Boolean Use another shape to cut, combine or perform a difference operation MOD_BOOLEAN
BUILD Build Cause the faces of the mesh object to appear or disappear one after the other over time MOD_BUILD
DECIMATE Decimate Reduce the geometry density MOD_DECIM

etc, etc

Example of using math node type enum to create operator. How to get custom menu items show up in the search bar?